It should be a goal of every serious photographer to invest in good lenses before selling the farm for latest and greatest camera body. Good lenses hold their value extremely well and their ergonomic and optical performance is usually well above cheaper models. With precious few exceptions, I recommend buying lenses of the same brand as your camera body. The optical quality of your photos is only as good as the glass you use. What’s the point of buying a $3,000 camera if you put an $350 zoom lens on the front? I could go on and on.
If anything else, it’s nice to know that you can send your entire system in for testing and cleaning in case something goes wrong. If you have problems with third party lenses, the camera manufacturer and lens manufacturer may blame each other for the problems you’re having.